Improving protein secretion of a transglutaminase-secreting Corynebacterium glutamicum recombinant strain on the basis of ^<13>C metabolic flux analysis(BIOCHEMICAL ENGINEERING)
スポンサーリンク
概要
- 論文の詳細を見る
Corynebacterium glutamicum is known as a host species for amino acid production. This microorganism was recently noticed as a host that produces secreted proteins. In this study, we performed ^<13>C metabolic flux analysis (^<13>C-MFA) on a recombinant C. glutamicum strain that secretes a heterologous transglutaminase (TGase) to improve TGase secretion. For the ^<13>C-MFA of a TGase-secreting C. glutamicum strain in batch cultivation, a ^<13>C-labeling experiment and measurement of mass isotopomer distributions of proteinogenic amino acids were performed, and metabolic fluxes were determined considering the changes in fractional ^<13>C-labeling of proteinogenic amino acids with respect to culture time. The TGase yield increased at the stationary phase but decreased toward its end. The results of ^<13>C-MFA revealed that the flux from glycolysis to the TCA cycle gradually increased during TGase secretion. We speculate that the NADH/NAD^+ ratio in the cells increases and that as a result, the specific glucose uptake rate decreases in the stationary phase because of the increased flux of the TCA cycle. Since it is expected that a decrease in the NADH/NAD^+ ratio would improve the TGase yield, we tried to enhance lactate production in a TGase-secreting C. glutamicum strain to decrease cellular NADH levels by increasing the pH level in the culture. The TGase yield increased in 1.4-fold by increasing the pH from 6.7 to 7.2, indicating that the TGase yield was successfully improved on the basis of the ^<13>C-MFA.
著者
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Hirasawa Takashi
Graduate School Of Information Science And Technology Osaka University
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Hirasawa Takashi
Department Of Bioengineering Tokyo Institute Of Technology
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Hirasawa Takashi
Osaka University
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Yasuhara Kazuo
Divisions Of Toxicology National Institute Of Hygienic Sciences
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安原 加壽雄
San-ei Gen F.f.i. Inc.
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Katakura Yoshio
Department Of Biotechnology Graduate School Of Engineering Osaka University
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Furusawa Chikara
Department Of Bioinformatic Engineering Graduate School Of Information Science And Technology Osaka
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Furusawa Chikara
Graduate School Of Information Science And Technology Osaka Univ.:erato Jst
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Kamimura Yasuhiro
Safety Evaluation Lab. Yoshitomi Pharm.
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Yoshikawa Katsunori
Department Of Bioinformatic Engineering Graduate School Of Information Science And Technology Osaka
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Shimizu Hiroshi
Department Of Bioinformatic Engineering Graduate School Of Information Science And Technology Osaka
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Kurokawa Y
Division Of Cellular & Molecular Toxicology National Institute Of Health Sciences
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Kodama Y
Biological Safety Research Center National Institute Of Health Science
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Takenaka Yasuhiro
Fermentation and Biotechnology Laboratories, Ajinomoto Co., Inc.
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Kawasaki Yasushi
National Institute Of Health Sciences
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Kashida Y
Laboratory Of Veterinary Pathology Tokyo University Of Agriculture And Technology
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Kawasaki Yasushi
Div.of Toxicol. National Institute Of Health Sciences
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Shimizu Hiroshi
Department Of Animal Science Faculty Of Agriculture Hokkaido University
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Furusawa Chikara
Grad. School Of Information Science And Technology Osaka Univ.:erato Complex Systems Biology Project
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Shimizu Hiroshi
Department Of Bioinformatic Engineering Graduate School Of Information Science And Technology Osaka
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Umakoshi Motoki
Department Of Bioinformatic Engineering Graduate School Of Information Science And Technology Osaka
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Kikuchi Yoshimi
Fermentation and Biotechnology Laboratories, Ajinomoto Co. Ltd.
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Takenaka Yasuhiro
Fermentation And Biotechnology Laboratories Ajinomoto Co. Ltd.
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Katakura Yoshio
Department Of Bioinformatic Engineering Graduate School Of Information Science And Technology Osaka University
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Yasuhara Kazuo
Division Of Toxicology Biological Safety Research Center National Institute Of Hygienic Sciences
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SHIMIZU HIROSHI
Department of Anatomy, School of Medicine, Tokushima University
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